string theory Meaning in the Cambridge English Dictionary
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Meaning of “string theory” in the English Dictionary

"string theory" in British English

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string theorynoun [U]

uk   us   specialized
a ​theory that says that the most ​basicpieces of ​matter are ​extremelysmalllines or ​circlesrather than ​points
(Definition of string theory from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"string theory" in American English

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string theorynoun [C]

 us   /ˈstrɪŋ ˌθɪər·i, ˌθi·ə·ri/
physics a ​theoryexplaining the ​character of ​matter and the ​forces of the ​universe, ​based on the ​idea that they ​behave more like ​closedcircles of ​string than like ​points
(Definition of string theory from the Cambridge Academic Content Dictionary © Cambridge University Press)
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